US3750016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rf-source resistance meters
Assignee: Individual
•
Filing: 1971-02-19
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Granted: 1973-07-31
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Expires: 1991-02-19
Abstract
Abstract Several embodiments of RF source resistance measuring devices are disclosed. Common to all embodiments is the feature of the inclusion of at least one variable resistor, and a peak readout meter. In one embodiment, two ganged unloaded potentiometers are employed while another embodiment comprises an automatic-nulling RF power bridge circuit with a variable rather than a fixed bridge reference resistance. A third embodiment comprises a calorimeter with a variable rather than a fixed resistor, while in another embodiment attenuator pads with variable resistors are employed.
Inventors
- 👤 G Low
- 👤 E Oakley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:29
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
185 words
A device for measuring the resistance of a source comprising: a first variable resistor having first and second ends connected across said source, said first variable resistor having a rotatable wiper arm, connected to the second end of said first resistor; a second variable resistor having first and second ends connected respectively to the first and second ends of said first variable resistor, said second resistor having a rotatable wiper arm, said wiper arms being ganged and phased for simultaneous rotation whereby at each rotational position the ratio of the resistance between the second end of said first resistor and its wiper arm in the absence of the connection therebetween to the total resistance of said first resistor is equal to the ratio of the resistance between the second end of said second resistor and its wiper arm to the total resistance of said second resistor; and readout means connected across the wiper arm of said second resistor and the second end thereof for providing a peak reading as a function of the rotational positions of the wiper arms and the resistance of said source.
Claim 2
Independent Claim
185 words
A device for measuring the resistance of a source comprising: a first variable resistor having first and second ends connected across said source, said first variable resistor having a rotatable wiper arm, connected to the second end of said first resistor; a second variable resistor having first and second ends connected respectively to the first and second ends of said first variable resistor, said second resistor having a rotatable wiper arm, said wiper arms being ganged and phased for simultaneous rotation whereby at each rotational position the ratio of the resistance between the second end of said first resistor and its wiper arm in the absence of the connection therebetween to the total resistance of said first resistor is equal to the ratio of the resistance between the second end of said second resistor and its wiper arm to the total resistance of said second resistor; and readout means connected across the wiper arm of said second resistor and the second end thereof for providing a peak reading as a function of the rotational positions of the wiper arms and the resistance of said source.
Claim 3
Dependent Claim
24 words
A device as recited in claim 1 wherein said readout means is a voltmeter and said second resistor is larger than said first resistor.
Claim 4
Dependent Claim
27 words
A device as recited in claim 2 wherein said source is a radio-frequency source and said voltmeter has a frequency response including the frequency of said source.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |